Printed circuit assembly for a dynamoelectric machine

Abstract

A dynamoelectric machine includes a stator having a stator core. A winding is provided on the stator core and the stator core has a stator bore. A rotor including a rotor core is received in the stator bore. A permanent magnet is mounted on the rotor core periphery and a rotor shaft is mounted on the rotor core. Bearing means are provided for supporting the rotor shaft for rotation relative to the stator. A first circuit board having electrical components thereon is used in operating the dynamoelectric machine, and a second circuit board having an electrical component in the form of a sensing device thereon is used in determining the position of the rotor. The first circuit board is constructed for mounting the second circuit board thereon so that the second circuit board projects axially inwardly from the first circuit board and the sensing device is disposed in an axial position overlapping the axial position of the permanent magnet.

What is claimed is:  
     
       1. A circuit board assembly comprising a unitary circuit board blank having a first circuit board and a second circuit board formed therein, printed wiring disposed on a first side of the first and second circuit boards and electrical components disposed on a second side of the first and second circuit boards, the electrical components being connected to the printed wiring on the first side of the first and second printed circuit boards, wiring connected to the printed wiring on the first circuit board and extending from the first circuit board to the second circuit board on the second side of the first and second circuit boards, the second circuit board being attached by a frangible portion of the circuit board blank to the first circuit board whereby the second circuit board may be selectively removed from the first circuit board while maintaining electrical connection through the wiring, and an integral connector element formed in the blank and formed as one-piece with the second circuit board, said connector element constructed for engagement with the first circuit board for mounting the second circuit board on the first circuit board. 
     
     
       2. A circuit board assembly as set forth in claim  1  wherein the connector element is constructed for mounting the second circuit board in a non-coplanar orientation with the first circuit board and so that the second circuit board is generally in fixed position relative to the first circuit board. 
     
     
       3. A circuit board assembly as set forth in claim  2  wherein the first circuit board further comprises at least one slot formed therein and the connector element comprises at least one L-shaped hanger sized and shaped for reception in the slot. 
     
     
       4. A circuit board assembly as set forth in claim  1  wherein the first circuit board has a central opening and a wire slot extending radially outwardly from the central opening and constructed for receiving the wiring through the first circuit board generally at a radially outer end of the wire slot when the second circuit board is mounted on the first circuit board by interconnection of the first and second connector elements. 
     
     
       5. A circuit board assembly as set forth in claim  4  wherein the electrical component mounted on the second circuit board is a Hall device. 
     
     
       6. A circuit board assembly as set forth in claim  5  wherein the second circuit board is disposed in the central opening of the first circuit board. 
     
     
       7. A circuit board assembly comprising a unitary circuit board blank having a first circuit board and a second circuit board formed therein, printed wiring disposed on a first side of the first and second circuit boards and electrical components disposed on a second side of the first and second circuit boards, the electrical components being connected to the printed wiring on the first side of the first and second printed circuit boards, wiring connected to the printed wiring on the first circuit board and extending from the first circuit board to the second circuit board on the second side of the first and second circuit boards, the second circuit board being attached by a frangible portion of the circuit board blank to the first circuit board whereby the second circuit board may be selectively removed from the first circuit board while maintaining electrical connection through the wiring, and said first circuit board further comprising a central opening and a wire slot extending radially outwardly from the central opening and constructed for receiving the wiring through the first circuit board generally at a radially outer end of the wire slot when the second circuit board is mounted on the first circuit board. 
     
     
       8. A circuit board assembly as set forth in claim  7  wherein the electrical component mounted on the second circuit board is a Hall device. 
     
     
       9. A circuit board assembly as set forth in claim  8  wherein the second circuit board is disposed in the central opening of the first circuit board. 
     
     
       10. A circuit board assembly as set forth in claim  7  wherein the second circuit board is disposed in a central opening of the first circuit board.